Honestly a big part of this is that the “dumb” phones are just as, if not more, expensive than a used or low end smartphone.
My daughter did use a dumb phone for a while, but then they started shutting down 2G and some 3G masts in the area and it was causing problems. There are some newer dumb phones that can use 4G, but given the prices and half of them still using micro usb for some damn reason (I’m a big fan of just carrying around one charger) it made more sense for me to give her an old smartphone and lock it down a little.
I’m a big fan of just carrying around one charger
Off topic, but I bought a handful of magnetic cables and a few different ends to match our devices, and now one cable works for charging everything.
It has the downside of not letting you connect the device to a computer, but because they’re magnetic, they’re breakaway cables. My kid has walked away with their tablet after forgetting to unplug it, and nothing bad happens 👍
